JP5307430B2 - Operation controller for dehydrator in gas hydrate production plant - Google Patents

Description

  The present invention, for example, dehydrates low-concentration gas hydrate produced by a natural gas hydrate production plant that produces natural gas existing under the seabed into a gas hydrate suitable for transportation and storage. The present invention relates to an operation control device for a dehydrator in a gas hydrate production plant for stably operating a dehydrator of a dehydrator that performs processing and generates a high-concentration gas hydrate slurry.

  Natural gas hydrate (NGH), the main component of which is methane, exists under the seabed at a depth of 500 m or less in frozen land zones such as Siberia, Canada, and Alaska and in the continental area. This NGH is a water-like solid substance or clathrate hydrate that is composed of gas molecules such as methane and water molecules and is stable under low temperature and high pressure, and as clean energy that emits less carbon dioxide and air pollutants. It is attracting attention.

  Natural gas, after being liquefied, is stored and used as energy, but its production and storage are performed at an extremely low temperature of -162 ° C. On the other hand, natural gas hydrate has the advantage that it exhibits stable properties without being decomposed at −20 ° C. and can be handled as a solid. Because of these characteristics, it is possible to effectively use gas resources in undeveloped small and medium gas fields for reasons such as profitability existing all over the world, or short distance from small gas fields, small-scale transportation. Natural gas hydrate method (NGH method) can be utilized in the case of.

  In the NGH system, NGH suitable for transportation and storage is generated at NGH shipping bases such as small and medium gas fields, and transported to the desired NGH receiving base by transport ships and vehicles, etc., and the transported NGH is stored at the NGH receiving base. If necessary, it will be used as an energy source by the NGH gasifier. FIG. 4 is a schematic block diagram illustrating an example of the configuration of a gas hydrate generation plant used in the NGH shipping base. The mined raw material gas is sufficiently mixed with water and hydrated in the generator 1 which is a high-pressure reaction vessel, and a low concentration gas hydrate (GH) slurry is generated. The produced GH slurry is supplied to the dehydrator 3 by the feed pump 2 and dehydrated to produce a high concentration GH slurry. At this time, the GH slurry is supplied to the dehydrator 3 from the lowermost part of the dehydrator 3. The supplied GH slurry is dehydrated while gradually raising the dehydrator 3 and taken out from the upper end of the dehydrator 3. The taken-out gas hydrate is dehydrated and taken out as a powder or a GH powder or a GH slurry in a slurry form with a water content of about 60%. This gas hydrate is supplied to the pellet molding machine 4 and granulated to form GH pellets having a size suitable for transportation and storage. Next, after being cooled by the cooler 5 to a temperature at which it does not decompose even under normal pressure, it is supplied to the decompressor 6. That is, from the generator 1 to the cooler 5, processing is performed under normal temperature and high pressure, and the cooler 5 and the depressurization device 6 are processed to a temperature that does not decompose even under normal pressure. Thereafter, the generated GH pellets are fed to a storage tank and stored.

  FIG. 3 shows processing steps of the generator 1 and the dehydrator 3, and the raw material gas G and water W are supplied to the generator 1 in the reaction tank 1 a of the generator 1. The supplied raw material gas G and water W are stirred by the stirring device 1b, and the raw material gas G and water W react to generate low concentration GH. The unreacted source gas G is recovered from the upper part of the reaction tank 1a and supplied again from the bottom of the reaction tank 1a by the blower 1c. The generated GH slurry is fed together with unreacted water to the bottom of the dehydrator 3 by the feed pump 2. The unreacted water is dehydrated from the supplied GH slurry while ascending the dehydrator 3, and is fed from the upper part of the dehydrator 3 to the pellet molding machine 4 in the next step by a feeding device 3 c such as a screw feeder. The The dehydrator 3 has a double structure of an inner cylinder 3a and an outer cylinder 3b that accommodates the inner cylinder 3a. The GH slurry is supplied to the inner cylinder 3a, and dehydration from the GH slurry is conducted in the outer cylinder 3b. leak. The effluent water that has flowed out of the outer cylinder 3b is returned to the generator 1 by the recovery pump 3d and used for the reaction with the raw material gas G.

  For example, Patent Document 1 discloses gas hydrate dehydration provided with a vertical moving bed type dehydrator that gravity dehydrates water adhering to gas hydrate in order to smoothly carry out dehydrated GH slurry from the dehydrator 3. The dehydrator is a first tower body erected substantially vertically, connected to an upper part of the first tower body, and has a plurality of fine through holes, and the drainer section. And a second tower connected to the upper portion of the draining section, and the gas hydrate supplied from the bottom of the first tower and passing through the dehydrating section is conveyed upward. A conveying means is provided, and the gas hydrate in the dehydrator is conveyed to the unloader disposed above the dehydrator by the conveying means. A screw conveyor is used for the unloader and the unloading means.

JP2007-224116A

  In the dehydrator 3, moisture is removed as the supplied GH slurry rises. At the bottom of the dehydrator 3, unreacted water and GH slurry accompanied with the unreacted water are mixed, and a drive unit in which the GH slurry suspended with respect to the unreacted water stays is formed at the upper part. In the upper part of the driving part, there is a drainage part in which a large number of through holes are formed in the wall surface of the inner cylinder 3a, and the unreacted water flows out from the large number of through holes to the outer cylinder 3b. The GH slurry that has passed through this drainage part is in a state where the concentration is high, but it is still in a state with attached water. The accompanying attached water is removed by raising the GH slurry to a level higher than the water rise limit due to capillary action. For this reason, the dewatering part which becomes the height beyond the rise limit of the water by this capillary phenomenon is formed in the upper part of the drainage part. In this case, there is a dehydrator in which dehydration is performed by a pressurization method that lowers the rising limit of water by pressurization because the processing time becomes longer in the so-called gravity method dehydration process using gravity. .

  In the pressurization-type dehydrator, for example, when the supply of GH slurry to the dehydrator becomes unstable, the dehydration process of the GH slurry also becomes unstable. As described above, a drainage part is provided in the middle of the inner cylinder 3a. Since this drainage part is due to a large number of through holes formed in the wall of the inner cylinder 3a, the wall surface of the dehydrator The drainage from the GH slurry on the side is promoted, and the dehydration from the GH slurry in the center is delayed. In particular, when the dehydration process becomes unstable, the drainage from the GH slurry in the central part of the dehydrator may stagnate even though the drainage from the drainage unit is continued. For this reason, GH slurry stays in the central part of the dehydrator, drainage from the GH slurry near the wall surface is promoted exclusively, and the GH slurry does not exist on the wall surface portion of the drainage part. That is, the inner and outer sides of the inner cylinder 3a communicate with each other through the through hole of the drainage portion. In this case, in particular, the pressure applied to the dehydrator by the pressurization system will be released from the through hole of the drainage part, so the instability of the dehydration process will be further accelerated, and the dehydrator will be You will have to stop.

  By the way, when the dehydration process is performed stably, the GH slurry is sequentially processed, so that the discharge pressure of the feed pump that supplies the GH slurry to the dehydrator is substantially constant. On the other hand, if the dehydration process in the dewatering unit is not stable and the GH slurry stays, the load on the feed pump increases and the discharge pressure increases, and if excessive dewatering is performed, the discharge pressure Becomes smaller.

  In addition, when the dehydrator is in a stable operation state, the pressure does not fluctuate in each part of the dehydrator and maintains a substantially constant pressure, but when the operation state becomes unstable, each part of the dehydrator The pressure will fluctuate.

  Therefore, the present invention focuses on the discharge pressure of the feed water pump or the pressure in each part of the dehydrator, and operates the dehydrator in the gas hydrate production plant that operates the dehydrator so that the dehydration process can be performed stably. The object is to provide a control device.

As a technical means for achieving the above object, the operation control device of the dehydrator in the gas hydrate production plant according to the present invention provides a dehydration for dehydrating from the gas hydrate slurry produced in the gas hydrate production process. A drainage part provided with a cylindrical container and having a through-hole formed in a part of the wall of the container, the gas hydrate slurry is raised in the container, and the water is drained. operation control device of the dehydrator to remove was drained from the parts, the supply pressure detecting means for measuring the discharge pressure of the pump feed supplying gas hydrate slurry to the dewatering unit is provided, the effluent water flowing out from the drain portion Is introduced to the inlet side of the circulation pump, the discharge side of the circulation pump is connected to the discharge side of the feed pump, and the effluent is mixed with the gas hydrate slurry and recycled. The amount of mixed effluent water supplied to the dehydrator is increased when the discharge pressure rises according to the detection result of the supply pressure detecting means, and is decreased when the discharge pressure decreases, and the gas hydrate slurry is reduced. It is characterized by adjusting the supply amount .

  When the dehydration process in the dehydrator becomes unstable and the GH slurry is stagnated and becomes blocked, the load on the feed pump increases and the discharge pressure increases. For this reason, the operation state of the dehydrator can be grasped by measuring the discharge pressure. The supply amount of GH slurry is adjusted according to the measurement result of the discharge pressure. For example, when the GH slurry stays and the discharge pressure of the feed pump increases, the supply amount of the GH slurry is increased and the diluted GH slurry is supplied.

  That is, when the concentration of the GH slurry is increased by dehydration in the dehydrator, the GH slurry or GH powder is consolidated, and the frictional force between the inner wall surface of the inner cylinder increases and the GH slurry or GH powder is increased. The rise of the will be hindered to stay. For this reason, by increasing the supply amount of the GH slurry to be supplied, increasing the water content of the GH slurry, and reducing the frictional force, the GH slurry is retained. When the dehydration process is excessive, the supply amount of GH slurry is decreased.

  Moreover, since the unreacted water accompanying the GH slurry in the dehydrator flows out from the drainage section, the effluent water is returned to the discharge side of the feed pump and circulated. By adjusting the amount of the effluent water, the flow rate of the GH slurry supplied to the dehydrator is adjusted, so the supply amount to the discharge side of the feed pump is adjusted according to the discharge pressure of the feed pump. . That is, when the amount of effluent water is increased, the supply amount of GH slurry is increased, and when the amount of effluent water is decreased, the supply amount of GH slurry is decreased. In addition, the circulation path supplied to a dehydrator can also be comprised by connecting to the discharge side of a feed pump in the middle of the discharge side of the collection pump mentioned above.

Incidentally, the adjustment of the supply amount of GH slurry can also be carried out by adjusting the discharge amount of the feed supplying GH slurry to dehydrator pump. When the dehydration process in the dehydrator is stagnant, the discharge rate is increased to increase the water content of the GH slurry. When the dehydration process becomes excessive, the discharge amount is reduced to reduce the water content.

An operation control device for a dehydrator in a gas hydrate production plant according to the invention of claim 2 is a dehydrator for dehydrating gas hydrate slurry produced in the gas hydrate production process, and is cylindrical. And a drainage part in which a through hole is formed in a part of the wall of the container is provided, and the gas hydrate slurry is raised in the container, and water is discharged from the drainage part to be removed. In the operation control device of the dehydrator, supply pressure detection means for measuring the discharge pressure of the feed pump that supplies the gas hydrate slurry to the dehydrator is provided, and the effluent water that has flowed out of the drainage section is provided on the inlet side of the circulation pump. Introducing, connecting the discharge side of the circulation pump to the discharge side of the feed pump, mixing the effluent water into the gas hydrate slurry and supplying it again to the dehydrator, the supply pressure When the discharge pressure rises as a result of detection by the discharge means, the amount of the effluent water mixed is increased to increase the supply amount of the gas hydrate slurry, and / or the generation conditions in the gas hydrate generator If the gas hydrate concentration is decreased to reduce the discharge pressure, the amount of effluent water mixed is decreased to reduce the gas hydrate slurry supply rate and / or the generation It is characterized in that the gas hydrate concentration is increased by changing the generation conditions in the vessel.

  As described above, the supply amount of the gas hydrate slurry is adjusted and / or the concentration of the supplied gas hydrate is adjusted based on the detection result by the supply pressure detection means. In other words, if the discharge pressure increases, increase the supply amount or decrease the gas hydrate concentration, either or both, and if the discharge pressure decreases, decrease the supply amount Or increasing the concentration of the gas hydrate, either one or both operations are performed.

  Further, the gas hydrate concentration is adjusted by changing the processing temperature in the gas hydrate generator. That is, when the processing temperature in the gas hydrate generator is lowered, the degree of supercooling increases and the amount of gas hydrate produced increases, so that a gas hydrate with a high concentration is produced, and it is produced when the treatment temperature is raised. The amount is reduced to produce a low concentration gas hydrate. Therefore, what is necessary is just to change the process temperature of a generator according to the discharge pressure of a feed pump. In addition, by controlling the concentration of the gas hydrate and adjusting the supply amount of the gas hydrate slurry, the operation of the dehydrator can be more finely controlled.

An operation control device for a dehydrator in a gas hydrate production plant according to the invention of claim 3 is a dehydrator for dehydrating gas hydrate slurry produced in a gas hydrate production process, and is cylindrical. And a drainage part in which a through hole is formed in a part of the wall of the container is provided, and the gas hydrate slurry is raised in the container, and water is discharged from the drainage part to be removed. operation control device of the dehydrator, to change the supply pressure detecting means for measuring the discharge pressure of the pump feed supplying gas hydrate slurry to the dewatering unit, the temperature of the gas hydrate slurry is supplied to the dehydrator It has a slurry temperature adjusting means, and a dehydrator temperature adjusting means for adjusting the internal temperature of the dehydrator, based on the detection result of the supply pressure detecting means, the discharge pressure rises Is characterized by heating the gas hydrate slurry by one or both of the slurry temperature adjusting means or dehydrator temperature adjusting means when that.

  When the dehydration process of the dehydrator is stagnant, the GH slurry is consolidated and the frictional force between the inner wall surface of the inner cylinder is increased. For this reason, part of the GH slurry supplied to the dehydrator is decomposed to improve the fluidity of the GH slurry. Since the GH slurry decomposes when the temperature exceeds a predetermined temperature, the GH slurry is cooled to a predetermined temperature or lower when being dehydrated by the dehydrator. For this reason, a part of the GH slurry is decomposed by heating the supplied GH slurry by the slurry temperature adjusting means.

  Further, the GH slurry supplied to the dehydrator is decomposed by heating by the dehydrator temperature adjusting means, thereby improving the fluidity of the GH slurry.

According to a fourth aspect of the present invention, the dehydrator operation control device in the gas hydrate production plant is provided with dehydrator pressure detecting means at different positions of the dehydrator, and the dehydrator temperature adjusting means is different from the dehydrator. The dehydrator temperature adjusting means corresponding to the portion where the pressure fluctuation is generated is operated based on the result detected by the dehydrator pressure detecting means. It is characterized by adjusting the internal temperature.

  By disposing the dehydrator temperature adjusting means in different parts of the dehydrator and decomposing the GH slurry existing in the corresponding part, the minimum GH slurry is decomposed to ensure fluidity. is there. The location where the GH slurry to be decomposed exists is grasped by the pressure fluctuation detected by the dehydrator pressure detecting means provided at different positions of the dehydrator.

  According to the operation control device of the dehydrator in the gas hydrate production plant according to the present invention, by measuring the discharge pressure of the feed pump for supplying the GH slurry to the dehydrator, the fluctuation of the operation state in the dehydrator can be reduced. Can be detected. The operating state of the dehydrator can be stabilized by adjusting the supply amount and concentration of the GH slurry based on the detection result.

Moreover, according to the operation control apparatus of the dehydrator in the gas hydrate production plant according to the invention of claim 3 , a part of the GH slurry supplied to the dehydrator or a part of the GH slurry in the dehydrator is decomposed. As a result, the hydrate adherence to the inner cylinder wall surface is released, the fluidity of the GH slurry is increased, and the stagnant GH slurry can be raised. For this reason, the dehydrating process of the dehydrator can be continued, and the continuous process of the dehydrator can be performed smoothly.

  In addition, since the GH slurry in the dehydrator is partly decomposed by the dehydrator temperature adjusting means and the fluidity is improved, continuous operation of the dehydrator can be performed smoothly.

Moreover, according to the operation control apparatus of the dehydrator in the gas hydrate production plant according to the invention of claim 4 , it is possible to quickly grasp the portion where the GH slurry is retained and blocked by the plurality of pressure detection means. At the same time, the GH slurry in the closed portion can be decomposed, so that the efficiency of the dehydrating process of the dehydrator is hardly lowered and the continuous operation can be performed smoothly.

  The dehydrator operation control apparatus in the gas hydrate production plant according to the present invention will be specifically described below based on the preferred embodiments shown in the drawings.

  FIG. 1 is a diagram for explaining a process by a dehydrator 10 provided with an operation control apparatus according to the present invention and the generator 1 that generates a low-concentration GH slurry to be supplied to the dehydrator 10. The GH slurry generated by the generator 1 is supplied to the dehydrator 10 by the feed pump 2 through the feed pipe 2a. A heat exchanger 12 serving as a slurry temperature adjusting means is provided in the middle of the feed pipe 2a, and the GH slurry flowing through the feed pipe 2a passes through the heat exchanger 12 so that the heat exchanger 12 Heat exchange with the heat medium supplied to 12 is performed.

  The dehydrator 10 has a double structure in which an inner cylinder 10a is accommodated in an outer cylinder 10b. The dehydration process in the dehydrator 10 needs to be performed under a high pressure at which the GH slurry is not decomposed, and the inner cylinder 10a is opened at the drainage portion as will be described later. No pressure resistance is required for 10a, and the outer cylinder 10b is a pressure vessel. The feed pipe 2a is connected to the bottom of the inner cylinder 10a, and the GH slurry is supplied to the bottom of the inner cylinder 10a. It is also possible to provide a structure in which an outer cylinder is partially provided so as to surround the drainage portion and the inner cylinder 10a is used as a pressure vessel.

  FIG. 2 is a diagram for explaining the outline of the structure of the dehydrator 10 and shows the state of the supplied GH slurry S in the dehydrator 10. The GH slurry S supplied to the dehydrator 10 rises in the inner cylinder 10a and reaches the drainage part 11b. The drainage part 11b is a part in which a large number of through holes are formed in the wall of the inner cylinder 10a, and unreacted water accompanied by the GH slurry S is discharged from the drainage part 11b to the outside of the inner cylinder 10a. Will be. Since the inner cylinder 10a is accommodated in the outer cylinder 10b, the unreacted water flowing out from the drainage part 11b flows into the outer cylinder 10b. A circulation pump 13 is connected to the bottom of the outer cylinder 10b via a recovery pipe 13a. A discharge pipe 13b of the circulation pump 13 is connected to the feed pipe 2a via a circulation valve 14. The effluent water that has flowed out of the drainage part 11b into the outer cylinder 10b is supplied to the inner cylinder 10a by the circulation pump 13 through the feed pipe 2a. In FIG. 3, as indicated by an imaginary line, the discharge side of the recovery pump 3 d may be branched and connected to the discharge side of the feed pump 2 via the circulation valve 14.

  Since the unreacted water is discharged in the drainage part 11b, the GH slurry S stays in the part facing the drainage part 11b, and on the other hand, the GH slurry S is sequentially supplied from below, so this stayed. The density of the GH slurry S increases and becomes a nodule B and extends downward. In addition, since the drainage portion 11b is formed on the wall, the GH slurry S in the vicinity of the drainage portion 11b is promoted to rise, and the nodule B in which the GH slurry S in the vicinity of the center portion of the inner cylinder 10a stays increases. For this reason, as shown in FIG.1 and FIG.2, the nodule B of GH slurry S becomes the external shape approximated to the cone shape which protruded below. The portion where the baby boom B exists is the drive unit 11a, and below this is the preparation unit 11d in which the GH slurry S in a state where the gas hydrate is dispersed in a large amount of unreacted water flows in and rises. Is done. Further, a dewatering portion 11c is formed above the drainage portion 11b by a layer formed of the GH slurry S from which unreacted water has been removed. In this dewatering part 11c, the adhering water accompanying the rising GH slurry S is separated and removed from the GH slurry S due to the rise limit of capillary action, and the concentration is increased to produce GH slurry S or GH powder. Is done. That is, in the dehydrator 10, the concentration of the GH slurry S gradually increases toward the top.

Each of the preparation unit 11d, the drive unit 11a, the drainage unit 11b, the dewatering unit 11c, the vicinity of the uppermost part of the inner cylinder 10a, and the uppermost part of the dehydrator 10 are pressure sensors as supply pressure detecting means. P ₀ , P ₁ , P ₂ , P ₃ , P ₄ , and P ₅ are arranged so that the pressure in each portion is detected. A pressure sensor P ₆ is provided as supply pressure detection means for detecting the discharge pressure of the feed pump 2. Further, a tubular heat medium flow path 16 as a dehydrator temperature adjusting means is wound around the outer peripheral surface of the inner cylinder 10a. The heat medium flow path 16 is spirally wound at an appropriate interval and is divided into portions corresponding to the pressure sensors P ₁ , P ₂ , P ₃ , P ₄ , and P _5. The heat medium can be circulated separately. That is, as shown in FIGS. 1 and 2, the heat medium flow path 16a corresponding to the pressure sensor P ₁ and the heat medium flow path 16b corresponding to the pressure sensor P ₂ correspond to the pressure sensor P _3. heat medium channel 16c is, the heat medium flow path 16d is in response to the pressure sensor P _4, the heat medium flow path 16e corresponds to a pressure sensor P ₅ is provided separately, respectively. Note that hot water or the like having an appropriate temperature can be used as the heat medium.

  Also, a temperature sensor for measuring the temperature of the GH slurry at the inlet to the dehydrator 10 of the feed pipe 2a, the GH slurry collected in the outer cylinder 10b of the dehydrator 10, and the GH slurry that has been dehydrated. 17 is arranged corresponding to each part. In addition, you may arrange | position a temperature sensor to another part as needed.

  The operation of the operation controller for the dehydrator in the gas hydrate production plant according to the present invention configured as described above will be described below.

When the discharge pressure of the feed pump 2 is measured by the pressure sensor P ₆ and the dehydrator 10 is in a stable operation state, the discharge pressure is substantially constant and does not vary greatly. When the dehydrator 10 is in a stable operating state, the supplied GH slurry S gradually rises from the preparation unit 11d to the drive unit 11a and the drainage unit 11b, and the unreacted water accompanying the GH slurry S is drained. It flows out from 11b to outer cylinder 10b. The GH slurry S from which the unreacted water has been removed moves up the dehydrating part 11c, and the unreacted water attached to the GH slurry S is removed to produce a high-concentration GH slurry S or GH powder. On the other hand, since the concentration of the GH slurry S is high in the dewatering unit 11c, the dehydration unit 11c is in a consolidated state, and the frictional force with the inner cylinder 10a is increased. For this reason, the GH slurry S is in a closed state, and the rise of the supplied GH slurry S may be inhibited. In this state, the internal pressure of the dehydrator 10 increases and the load on the feed pump 2 increases. For this reason, the discharge pressure of the feed pump 2 increases.

  When the discharge pressure of the feed pump 2 increases, the supply amount of the GH slurry S supplied to the dehydrator 10 is increased. Alternatively, the concentration of the supplied GH slurry S is lowered. In order to increase the supply amount of the GH slurry S, the discharge amount of the feed pump 2 is increased. Thereby, the unreacted water accompanying the GH slurry S supplied to the dehydrator 10 increases, and the fluidity of the GH slurry S increases. For this reason, the consolidated GH slurry S flows, and the closed state is released. Also, by reducing the concentration of the GH slurry S, the load of dehydration processing in the dehydrator 10 is reduced, so that the fluidity of the GH slurry S is increased and the blocked state is released. In addition, the change of the density | concentration of GH slurry S is based on changing the production | generation conditions in the generator 1 of a previous process. That is, in the generator 1, the raw material gas and the cooling water for reaction are mixed and stirred. At this time, when the temperature of the cooling water is lowered, the reaction between the raw material gas and the cooling water is promoted to increase the concentration of the GH slurry S, and when the temperature of the cooling water is increased, the concentration of the GH slurry S is decreased. Become. Alternatively, the concentration of the GH slurry S can be adjusted by changing the supply amount of the raw material gas and the supply amount of the cooling water.

  On the other hand, when the dehydration process in the dehydrator 10 becomes excessive, it can be adjusted by decreasing the supply amount of the GH slurry S or increasing the concentration of the GH slurry S.

  Furthermore, the supply amount of the GH slurry S to the dehydrator can also be adjusted by adjusting the supply amount of the recovered water passing through the circulation pump 13 to the feed pipe 2a. That is, when the GH slurry S is clogged in the dehydrator 10, the supply amount to the feed pipe 2a is increased, and the GH slurry S is diluted with effluent water to increase the supply amount, resulting in excessive dehydration treatment. In this case, the supply amount of the effluent water to the feed pipe 2a is reduced, and the GH slurry S is supplied to the dehydrator 10 without diluting. The supply amount of the outflow water feed pipe 2a can be performed by adjusting the opening degree of the circulation valve 14.

  In addition, by heating the GH slurry S supplied to the dehydrator 10 to the decomposition temperature and supplying the GH slurry S, the fluidity of the GH slurry S can be improved and the closed state of the dehydrator 10 can be released. That is, a heat medium is circulated through the heat exchanger 12, and the GH slurry S flowing through the feed pipe 2a is heated to the decomposition temperature. As a result, the gas hydrate formation reaction does not occur on the inner cylinder wall surface, and adhesion to the inner wall is prevented. Further, a part of the GH slurry S supplied to the dehydrator 10 is decomposed and diluted to improve the fluidity. Therefore, the closed state in the dehydrator 10 is released.

Further, according to the measurement results of the pressure sensors P ₀ , P ₁ , P ₂ , P ₃ , P ₄ , and P ₅ , the GH slurry S is blocked at the portion where the pressure sensor P having increased pressure is disposed. I can grasp that. In this case, a heat medium such as hot water is circulated through the heat medium flow path 16 provided at a position corresponding to a portion of the heat medium flow path 16 where the pressure sensor P that measures a large pressure is disposed. As a result, the inside of the dehydrator 10 of the part is heated, the GH slurry S causing the blockage is decomposed and fluidity is generated, and the rise of the GH slurry S in the dehydrator 10 is smoothly performed. As a result, the dehydrating process of the dehydrator 10 can be continued. Moreover, since the portion of the GH slurry S where the blockage has occurred is decomposed, the blockage state can be quickly released and the reduction in dewatering efficiency can be minimized.

  In the embodiment described above, the structure in which the heat medium flow path 16 is spirally wound around the inner cylinder 10a as the dehydrator temperature adjusting means has been described. However, the structure is not limited to the heat medium flow path 16. For example, a shower nozzle or the like that injects hot water toward the inner cylinder 10a may be provided so that the hot water is sprayed onto the inner cylinder 10a. In this case, if shower nozzles are arranged at a plurality of locations corresponding to the pressure sensor P, hot water is jetted from the portion of the pressure sensor P corresponding to the pressure sensor P that has detected a large pressure. Then, the GH slurry S in the corresponding part can be decomposed. Further, it may be by adjusting the temperature of the gas phase portion between the inner cylinder 10a and the outer cylinder 10b. In this structure, when any of the pressure sensors P detects a large pressure, the inner cylinder 10a is heated by supplying warm air or the like to the gas phase portion.

  According to the operation control device of the dehydrator in the gas hydrate generation plant according to the present invention, the operation state of the dehydrator can be stabilized, which contributes to the continuous operation of the gas hydrate generation plant without any trouble.

It is a figure explaining the structure of the operation control apparatus of the dehydrator in the gas hydrate production | generation plant which concerns on this invention, and has shown the process by the generator and dehydrator of a gas hydrate production | generation plant. It is sectional drawing explaining the general | schematic structure of the dehydrator operation-controlled by the operation control apparatus which concerns on this invention. It is a schematic block diagram explaining the production | generation process of the gas hydrate in a generator, and the dehydration process in a dehydrator. It is a schematic block diagram explaining an example of a structure of a gas hydrate production | generation plant.

Explanation of symbols

1 generator 2 feed pump
2a Feed pipe
3c Feeder
3d recovery pump
10 Dehydrator
10a inner cylinder
10b outer cylinder
11a Drive unit
11b Drainage section
11c Dehydration part
11d Preparation Department
12 Heat exchanger
13 Circulation pump
13a Recovery tube
13b Discharge pipe
14 Circulation valve
16 Heat transfer channel B Baby boom S GH slurry

Claims (4)

A dehydrator for dehydrating from a gas hydrate slurry generated in a gas hydrate manufacturing process, comprising a cylindrical container , and a drainage part in which a through hole is formed in a part of a wall of the container In the operation control device of the dehydrator that is provided and raises the gas hydrate slurry in the container to discharge the moisture from the drainage part and remove it ,
The gas hydrate slurry provided the supply pressure detecting means for measuring the discharge pressure of the feed pump is supplied to the dehydrator,
The effluent water flowing out from the drainage part is introduced to the inlet side of the circulation pump, the discharge side of the circulation pump is connected to the discharge side of the feed pump, and the effluent water is mixed with the gas hydrate slurry. The gas hydrate slurry is supplied again to the dehydrator and is increased when the discharge pressure is increased by the detection result by the supply pressure detecting means and decreased when the discharge pressure is decreased. An operation control device for a dehydrator in a gas hydrate production plant, characterized in that the supply amount of the dehydrator is adjusted.   A dehydrator for dehydrating from a gas hydrate slurry generated in a gas hydrate manufacturing process, comprising a cylindrical container, and a drainage part in which a through hole is formed in a part of a wall of the container In the operation control device of the dehydrator that is provided and raises the gas hydrate slurry in the container to discharge the moisture from the drainage part and remove it,
  Supply pressure detection means for measuring the discharge pressure of a feed pump that supplies gas hydrate slurry to the dehydrator,
  The effluent water flowing out from the drainage part is introduced to the inlet side of the circulation pump, the discharge side of the circulation pump is connected to the discharge side of the feed pump, and the effluent water is mixed with the gas hydrate slurry. Supply it again to the dehydrator,
  When the discharge pressure rises as a result of detection by the supply pressure detection means, the amount of the effluent water mixed is increased to increase the amount of gas hydrate slurry supplied, and / or in the gas hydrate generator Change the production conditions to lower the gas hydrate concentration,
  When the discharge pressure decreases, the amount of the effluent water is decreased to reduce the supply amount of the gas hydrate slurry, and / or the generation condition in the generator is changed to change the gas hydrate flow rate. An operation control device for a dehydrator in a gas hydrate production plant, characterized in that the concentration is increased.   A dehydrator for dehydrating from a gas hydrate slurry generated in a gas hydrate manufacturing process, comprising a cylindrical container, and a drainage part in which a through hole is formed in a part of a wall of the container In the operation control device of the dehydrator that is provided and raises the gas hydrate slurry in the container to discharge the moisture from the drainage part and remove it,
  Supply pressure detection means for measuring the discharge pressure of a feed pump that supplies gas hydrate slurry to the dehydrator;
  Slurry temperature adjusting means for changing the temperature of the gas hydrate slurry supplied to the dehydrator;
  A dehydrator temperature adjusting means for adjusting the internal temperature of the dehydrator,
  The gas hydrate slurry is heated by one or both of the slurry temperature adjusting means and the dehydrator temperature adjusting means when the discharge pressure rises based on the detection result of the supply pressure detecting means. Operation control device of dehydrator in gas hydrate production plant.   A dehydrator pressure detecting means is provided at a different position of the dehydrator,
  The dehydrator temperature adjusting means is provided in different parts of the dehydrator so that each part can be operated separately,
  4. The internal temperature of the dehydrator is adjusted by operating the dehydrator temperature adjusting means corresponding to the portion where the pressure fluctuation occurs based on the result detected by the dehydrator pressure detecting means. The operation control apparatus of the dehydrator in the gas hydrate production | generation plant of description.

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